Elon Musk is known for his innovative ideas and ambitious predictions about the future. However, many of these predictions have not come to pass, and some have been outright false. Here are some examples:

1. Hyperloop: In 2017, Musk tweeted that a hyperloop system would be built from New York to Los Angeles, with a top speed of 600 miles per hour. However, the only hyperloop project that has been developed is a small-scale test track in Nevada.

2. Autonomous driving: Musk has repeatedly promised that Tesla would have fully autonomous vehicles on the road within two years, but this has not happened yet. In 2018, he claimed that coast-to-coast drive would be possible within six months.

3. AI: Musk has expressed concerns about the dangers of AI, while also trying to develop it himself. He tweeted in 2014 that AI could be more dangerous than nukes and that we need to be super careful with AI. However, his own AI company, Grok, has been criticized for its lack of transparency and potential dangers.

4. Candy Company: In 2018, Musk tweeted that he was starting a candy company and it would be amazing, but this never materialized.

5. Model S distance record: Musk claimed in 2015 that the record for the longest distance driven in a Tesla was 800 kilometers (497 miles), and that they could break 1000 kilometers within a year or two. However, the record for the longest distance driven in a Tesla is only 901 kilometers (560 miles) and under strict conditions.

These examples show that Musk has a history of making bold predictions that do not come to pass and highlights the potential dangers of hyping new technologies without proper research and testing. It’s important to approach these predictions with skepticism and to remember that actual progress and success often takes longer and is more incremental than promised.